How did the civil war play a role in in advancing the us industrial progress?

During the Civil War, the production of cotton was up so high. They had farms everywhere, and still needed to increase productivity. So they built machines that could turn fresh cotton into clean cotton that they could start using to make clothes. The more machines they built, they more money they would make.

pretty sure it is c

explanation:

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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